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New build, kernel panic & freeze when using both ram sticks with XMP:profile1

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Hey all,

My first build, followed this site with recommended hardware for the CustoMac micro build (many thanks), and after a few build problems have Mavericks up and running, yay!

Problem is, as the build guide said I did the whole installation with 1 ram stick, with XMP set to profile1. When I added my second ram stick i would get freezes up to a couple of mins booting the system, which meant a hard restart. I then started getting kernal panics on boot. Remove the second ram stick and its fine everytime. If i add the second stick and disable XMP then it seems to work. Just did this and booted and have been using for about 15 mins fine. Only problem is now I have 1866 ram running at 1333.

Any help with how I can make the most of my ram speed without the freezing would be fantastic.

Build is

Gigabyte z87mx-d3h
Asus gtx 760
i5 4690k
Corsair vengence pro 1866 paired 8gb sticks
corsair RM 550
500gb samsung evo SSD
Mavericks 10.9.5

Any ideas? :think:

EDIT currently running a memtest with http://osxdaily.com/2011/05/03/memtest-mac-ram-test/ all ok so far...

EDIT looking at http://www.tonymacx86.com/mavericks-desktop-support/130034-help-install-getting-kernel-panic-2.html seems that maybe corsair was not the best choice.

EDIT Looking at the memory support list http://download.gigabyte.eu/FileList/Memory/mb_memory_ga-z87mx-d3h.pdf mine (CMY16GX3M2A1866C9R) isnt on there, there are very similar ones (CMZ...) though. Did I buy the wrong ram

EDIT kernel panic has started on boot again, with XMP disabled and both sticks in. I installed my GPU at the same time i started seeing this issue. I just disabled the integrated graphics in the BIOS and seems to be booting ok, but could be coincidence...
 
Sorry shouldve mentioned am running F7, had to flash to support my CPU. Will look into clover - i thought bootloaders would just be a UI change. Does it also do low-level stuff todo with RAM setup?
 
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